Cut Into Portion Of Garage Pitched Roof To Make A Deck. - Roofing/Siding - DIY Home Improvement | DIYChatroom

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Old 04-19-2013, 12:22 AM   #1
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Cut into portion of garage pitched roof to make a deck.

I have a pretty simple cape with an attached garage. I want to cut into the garage roof and remove the rafters for half the sloped roof, add a sliding door and create a deck out of the space. Has anybody seen this done before? Are there any gotchas you can think of? I already figured I would do the following.

*Cut into the south side of the roof's rafters and reinforce the existing sloped roof portion on the south side.
*Pitch the flat portion the roof for drainage.
*Install 3/4" plywood (deck subfloor).
*Install a vinyl waterproof membrane.
*Install sliding door
*Install railings

I'm wondering if this will severely weaken the portion of sloped roof remaining and how to best reinforce. Or perhaps this is a really bad idea?
It would be great to have another way to get outside from the second floor. I'd really like to make a deck there.

Please see photo here.

Your feedback is much appreciated.



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Old 04-19-2013, 01:12 AM   #2
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Welcome to the Forum!

you may want to edit your profile to include you location. this sometimes help in providing answers to questions. I could not view your photo.

what you propose is not difficult if done properly. this involves more than just cutting off a roof and throwing down a deck. I'd recommend hiring a professional engineer to design the structure for you. as you stated the remaining roof must be supported. one way of doing this is by installation of a ridge beam. depending on your ground snow loads and location you'll have to account for these loads on your deck and must determine how to support the deck. a lot of structural design would be required for this type of project.

now the simple question, why would you want a deck over your garage when you could built a deck next to your garage? don't have to worry with water getting into your garage. you could add a dormer if you need access from the area above the garage. It would be a lot simpler in my opinion to add a deck next to the garage than ripping your garage apart. does that make sense?



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